Why are DC motors used in trains, not AC Motors?

DC motors are used in trains because of their high torque and good speed control.

Compared to AC motors, DC motors can provide industry applications with a fine balance of strong starting torque and controllable speed for seamless yet precise performance.

Depending on the design of the train, this DC current can either be used directly to power the train’s traction motors or will need to be converted to three-phase AC using inverters.